:root {
  color-scheme: dark;
  --header-bg: rgba(7, 17, 31, .92);
  --body-copy: #b7c5d1;
  --button-text: #04211d;
  --button-hover: #b5dbd6;
  --bg: #07111f;
  --surface: #0c1929;
  --surface-2: #102236;
  --text: #eaf2f8;
  --muted: #91a4b7;
  --line: rgba(169, 194, 214, .17);
  --accent: #9ac7c2;
  --accent-2: #9ac7c2;
  --max: 1160px;
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #fafbf9;
  --surface: #f0f3f0;
  --surface-2: #e5ebe7;
  --text: #202e2b;
  --muted: #586b65;
  --body-copy: #43564f;
  --line: rgba(40, 68, 56, .2);
  --accent: #2d6b60;
  --accent-2: #2d6b60;
  --header-bg: rgba(250, 251, 249, .94);
  --button-text: #ffffff;
  --button-hover: #23564d;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 96px; }
body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: "Inter", "Noto Sans JP", sans-serif;
  line-height: 1.75;
}
a { color: inherit; text-decoration: none; }
strong { color: var(--text); }

.site-header {
  position: sticky;
  z-index: 10;
  top: 0;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: 72px;
  padding: 0 max(24px, calc((100vw - var(--max)) / 2));
  border-bottom: 1px solid var(--line);
  background: var(--header-bg);
  backdrop-filter: blur(16px);
}
.brand { font-size: 1.25rem; font-weight: 800; letter-spacing: -.04em; }
.brand span, .hero h1 span { color: var(--accent); }
nav { display: flex; gap: 24px; }
nav a, .header-link { color: var(--muted); font-size: .82rem; font-weight: 600; }
nav a:hover, .header-link:hover { color: var(--text); }
.header-link { justify-self: end; }
.header-actions { display: flex; align-items: center; justify-self: end; gap: 16px; margin-left: 24px; }
.theme-toggle { display: inline-flex; align-items: center; justify-content: center; gap: 7px; min-height: 44px; padding: 0 12px; border: 1px solid var(--line); border-radius: 24px; background: transparent; color: var(--text); font: inherit; font-size: .75rem; cursor: pointer; white-space: nowrap; }
.theme-toggle[hidden] { display: none; }
.theme-toggle:hover { background: var(--surface-2); border-color: var(--accent); }
.theme-icon { font-size: 1rem; }
@media (min-width: 801px) and (max-width: 1050px) {
  html { scroll-padding-top: 132px; }
  .site-header { grid-template-columns: 1fr auto; }
  .brand { padding-block: 12px; }
  nav { grid-column: 1 / -1; grid-row: 2; gap: 24px; padding-bottom: 8px; }
  nav a { display: inline-flex; align-items: center; min-height: 44px; }
  .header-actions { grid-column: 2; grid-row: 1; margin-left: 0; }
}

main, footer { overflow-wrap: anywhere; }
.hero > *, .section > *, .publication > *, .feature-card > * { min-width: 0; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 5px; }
.skip-link { position: fixed; top: -100px; left: 20px; z-index: 20; padding: 10px 16px; background: var(--text); color: var(--bg); }
.skip-link:focus { top: 12px; }
.hero, .section, footer { width: min(calc(100% - 48px), var(--max)); margin-inline: auto; }
.hero {
  display: grid;
  grid-template-columns: 1.35fr .65fr;
  align-items: center;
  gap: 9vw;
  min-height: 620px;
  padding: 96px 0;
}
.eyebrow, .section-number, .mini-label, .tag {
  color: var(--accent);
  font-size: .73rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
}
.hero h1 { margin: 18px 0 0; font-size: clamp(3.4rem, 7vw, 6rem); line-height: 1.05; letter-spacing: -.045em; }
.hero-ja { margin: 24px 0 0; color: var(--muted); font-weight: 600; letter-spacing: .3em; }
.lead { margin: 34px 0; font-size: clamp(1.2rem, 2vw, 1.55rem); line-height: 1.8; }
.hero-actions, .pub-links { display: flex; flex-wrap: wrap; gap: 12px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 49px; padding: 0 22px; border: 1px solid var(--line); font-size: .88rem; font-weight: 700; }
.button.primary { color: var(--button-text); border-color: var(--accent); background: var(--accent); }
.button.primary:hover { background: var(--button-hover); }
.button.secondary:hover { border-color: var(--muted); }
.hero-card { position: relative; padding: 32px; border: 1px solid var(--line); background: var(--surface); }
.status { display: flex; align-items: center; gap: 9px; margin-bottom: 26px; font-size: .75rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }
dl, dd { margin: 0; }
dl div { padding: 17px 0; border-top: 1px solid var(--line); }
dt { margin-bottom: 5px; color: var(--muted); font-size: .68rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; }
dd { font-size: .92rem; font-weight: 600; line-height: 1.55; }

.section { padding: 80px 0; border-top: 1px solid var(--line); }
.section h2, footer h2 { margin: 12px 0 0; font-size: clamp(1.8rem, 3vw, 2.6rem); line-height: 1.5; letter-spacing: -.025em; }
.about-grid { display: grid; grid-template-columns: .85fr 1.15fr; gap: 10vw; }
.personal-details { margin: 0; color: var(--body-copy); }
.personal-details div { display: grid; grid-template-columns: 64px minmax(0, 1fr); gap: 16px; padding: 12px 0; }
.personal-details div:last-child { border-bottom: 1px solid var(--line); }
.personal-details dt { margin: 0; font-size: .85rem; font-weight: 500; letter-spacing: normal; }
.personal-details dd { font-size: .9rem; font-weight: 400; line-height: 1.75; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 40px; margin-bottom: 56px; }
.section-heading > p { max-width: 350px; margin: 0; color: var(--muted); font-size: .9rem; }

.feature-card { display: grid; grid-template-columns: 28px minmax(0, 1fr) minmax(0, 1.25fr); gap: 28px; padding: 32px; background: var(--surface); border: 1px solid var(--line); }
.feature-index { color: var(--accent); font-size: .8rem; font-weight: 700; }
.feature-card h3 { margin: 14px 0; font-size: clamp(1.7rem, 3vw, 2.5rem); line-height: 1.35; letter-spacing: -.04em; }
.feature-text { color: var(--body-copy); }
.feature-text p { margin-top: 0; }
.feature-text ul { margin: 26px 0 0; padding: 0; list-style: none; }
.feature-text li { position: relative; padding: 10px 0 10px 24px; border-top: 1px solid var(--line); }
.feature-text li::before { position: absolute; left: 2px; color: var(--accent); content: "—"; }

.publication { display: grid; grid-template-columns: 200px minmax(0, 1fr); gap: 36px; padding: 44px 0; border-top: 1px solid var(--line); }
.publication:last-child { border-bottom: 1px solid var(--line); }
.publication.featured { border-top: 1px solid var(--line); }
.pub-meta { display: flex; flex-direction: column; gap: 5px; color: var(--muted); font-size: .78rem; font-weight: 600; text-transform: uppercase; }
.pub-meta span:first-child { color: var(--accent); font-size: 1rem; }
.pub-body h3 { max-width: 780px; margin: 10px 0 13px; font-size: clamp(1.25rem, 2vw, 1.75rem); line-height: 1.45; letter-spacing: -.02em; }
.pub-body > p:not(.tag, .pub-note) { color: var(--body-copy); font-size: .88rem; }
.pub-note { color: var(--muted); font-size: .83rem; }
.pub-links { margin-top: 22px; }
.pub-links a { padding-bottom: 2px; border-bottom: 1px solid var(--accent); color: var(--accent); font-size: .82rem; font-weight: 700; }

.experience-intro { margin: -24px 0 32px; color: var(--muted); font-size: .92rem; }

.split-section { display: grid; grid-template-columns: 1.3fr .7fr; gap: 9vw; }
.timeline { margin-top: 52px; }
.timeline div { position: relative; padding: 0 0 40px 30px; border-left: 1px solid var(--line); }
.timeline div::before { position: absolute; top: 7px; left: -5px; width: 9px; height: 9px; border-radius: 50%; background: var(--accent); content: ""; }
.timeline time { color: var(--accent); font-size: .74rem; font-weight: 700; letter-spacing: .08em; }
.timeline h3 { margin: 5px 0 2px; font-size: 1.25rem; }
.timeline p { margin: 0; color: var(--muted); font-size: .9rem; }
.award-panel { align-self: start; }
.award-panel h2 { margin-bottom: 32px; }
.award { display: grid; grid-template-columns: 64px minmax(0, 1fr); gap: 18px; padding: 24px 0; border-top: 1px solid var(--line); }
.award time { color: var(--muted); font-size: .85rem; }
.award h3 { margin: 0 0 6px; font-size: 1.1rem; }
.award p { margin: 0; color: var(--muted); font-size: .85rem; }
.subsection-title { margin: 0 0 20px; font-size: 1.15rem; }
.skill-list > div { display: grid; grid-template-columns: 180px minmax(0, 1fr); gap: 24px; padding: 22px 0; }
.skill-list dt { font-size: .85rem; letter-spacing: normal; }
.skill-list dd { font-size: .95rem; font-weight: 400; }
.skill-list p { margin: 6px 0 0; color: var(--muted); font-size: .88rem; }
.qualifications-title { margin-top: 48px; }
.qualification-list { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.qualification-list li { position: relative; display: grid; grid-template-columns: 120px minmax(0, 1fr); align-items: baseline; gap: 28px; padding: 24px 0 24px 24px; border-bottom: 1px solid var(--line); }
.qualification-list li::before { content: ""; position: absolute; left: 0; top: 35px; width: 5px; height: 5px; border-radius: 50%; background: var(--accent); }
.qualification-list time { color: var(--accent); font-size: .85rem; font-variant-numeric: tabular-nums; white-space: nowrap; }
.qualification-name { min-width: 0; font-size: 1rem; font-weight: 500; line-height: 1.8; }
.qualification-detail { color: var(--muted); font-size: .88rem; font-weight: 400; }
@media (max-width: 540px) {
  .qualification-list li { grid-template-columns: 1fr; gap: 6px; padding-block: 20px; }
  .qualification-list li::before { top: 30px; }
  .qualification-list time { font-size: .78rem; }
  .qualification-name { font-size: .92rem; }
}

footer { position: relative; display: grid; grid-template-columns: 1fr auto; align-items: end; gap: 40px; padding: 48px 0 32px; border-top: 1px solid var(--line); }
.copyright { grid-column: 1 / -1; margin: 24px 0 0; color: var(--muted); font-size: .72rem; }

@media (max-width: 800px) {
  .site-header { grid-template-columns: 1fr auto; padding-inline: 20px; }
  html { scroll-padding-top: 132px; }
  .brand, .header-link { padding-block: 12px; }
  .header-actions { grid-column: 2; grid-row: 1; margin-left: 0; }
  nav { grid-column: 1 / -1; grid-row: 2; flex-wrap: wrap; gap: 0 20px; padding-bottom: 8px; }
  nav a { display: inline-flex; align-items: center; min-height: 44px; font-size: .75rem; }
  .hero, .section, footer { width: min(calc(100% - 40px), var(--max)); }
  .hero { grid-template-columns: 1fr; gap: 36px; min-height: auto; padding: 48px 0; }
  .hero h1 { font-size: clamp(3rem, 14vw, 5rem); }
  .about-grid, .split-section { grid-template-columns: 1fr; gap: 50px; }
  .section { padding: 56px 0; }
  .section-heading { display: block; }
  .section-heading > p { margin-top: 25px; }
  .feature-card { grid-template-columns: 1fr; gap: 18px; padding: 32px 25px; }
  .publication, .publication.featured { grid-template-columns: 1fr; gap: 15px; padding: 34px 0; }
  .pub-meta { flex-direction: row; flex-wrap: wrap; gap: 8px 20px; justify-content: space-between; }
  .skill-list > div { grid-template-columns: 1fr; gap: 8px; }
  .pub-links a { display: inline-flex; align-items: center; min-height: 44px; }
  footer { grid-template-columns: 1fr; align-items: start; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}